Aluminum Electrolytic Capacitors

Part Number	Description / PDF	Quantity
UWD1H2R2MCL1GS Nichicon	CAP ALUM 2.2UF 20% 50V SMD	1734
100SGV33M10X10.5 Rubycon	CAP ALUM 33UF 20% 100V SMD	39
ALS81H334QT063 KEMET	CAP ALUM 330000UF 20% 63V SCREW	0
ALS71C334MF025 KEMET	CAP ALUM 330000UF 20% 25V SCREW	0
UHW1H561MHD Nichicon	CAP ALUM 560UF 20% 50V RADIAL	0
80ZLH33MEFC6.3X11 Rubycon	CAP ALUM 33UF 20% 80V RADIAL	2365
865090245007 Würth Elektronik Midcom	CAP 220 UF 20% 10 V	0
UPW1V270MDD6TP Nichicon	CAP ALUM 27UF 20% 35V RADIAL	1683
ALS71H472NF500 KEMET	CAP ALUM 4700UF 20% 500V SCREW	0
PSU64515 Cornell Dubilier Electronics	CAP ALUM 645UF 125V QC TERM	0
EEE-HBV470UAP Panasonic	CAP ALUM 47UF 20% 35V SMD	169
ECA-1EM470B Panasonic	CAP ALUM 47UF 20% 25V RADIAL	6000
ALF20G302KP400 KEMET	CAP ALU 3000UF 20% 400V PRESSFIT	0
25YXF2200MEFC16X25 Rubycon	CAP ALUM 2200UF 20% 25V RADIAL	294
ECE-A1CKS100B Panasonic	CAP ALUM 10UF 20% 16V THRU HOLE	3993
MAL212017222E3 Vishay BC Components/Beyshlag/Draloric	CAP ALUM 2200UF 20% 40V AXIAL	1100
UFG1H220MEM1TD Nichicon	CAP ALUM 22UF 20% 50V RADIAL	0
ALC70A361EB450 KEMET	CAP ALUM 360UF 20% 450V RADIAL	0
UUX1E221MNL6GS Nichicon	CAP ALUM 220UF 20% 25V SMD	760
UPJ1E470MED Nichicon	CAP ALUM 47UF 20% 25V RADIAL	1835

Aluminum Electrolytic Capacitors

1. Overview

Aluminum electrolytic capacitors are polarized capacitors using an aluminum oxide layer as the dielectric medium. They consist of an aluminum anode, electrolyte solution, and cathode. These capacitors offer high capacitance values (1 F-2.7F) with relatively compact size, making them essential components in power supply filtering, signal decoupling, and energy storage applications. Their evolution has enabled miniaturization in electronics while maintaining performance in harsh environments.

2. Main Types and Functional Classification

Type	Functional Characteristics	Application Examples
Radial Lead Type	Vertical mounting with dual leads	Consumer electronics power supplies
SMD Type	Surface-mount design for PCB integration	Computer motherboards
Stud Mount Type	High-current screw terminal design	Industrial inverters
Bi-polar Type	Able to withstand reverse voltage	Motor drive circuits

3. Structure and Composition

Typical construction includes: - Anode Foil: High-purity aluminum with etched surface (100-600m /m effective area) - Dielectric Layer: 0.1-0.8 m thick aluminum oxide (Al O ) - Electrolyte: Ammonium borate solution in organic solvent - Cathode Foil: 50-100 m aluminum sheet - Separator Paper: 50 m thick kraft paper soaked in electrolyte - Aluminum Case: 0.5-2.0mm thick stamped enclosure

4. Key Technical Specifications

Parameter	Description	Importance
Capacitance (C)	1 F-2.7F (120Hz measurement)	Determines filtering effectiveness
Rated Voltage (UR)	6.3V-630V DC working range	Failure risk above limit
ESR	5m -1.5 at 100kHz	Affects switching performance
Ripple Current	100mA-5A RMS	Lifetime predictor
Leakage Current	0.01C UR A maximum	Power efficiency factor
Operating Temp	-55 C to +150 C range	Reliability indicator

5. Application Fields

Power Electronics: Switching power supplies, UPS systems
Consumer Devices: TVs, gaming consoles, LED lighting
Industrial: Variable frequency drives, welding machines
Automotive: On-board chargers, ADAS systems
Renewables: Solar inverters, wind turbine converters

6. Leading Manufacturers

Manufacturer	Headquarters	Representative Product
Nichicon	Japan	UPW Series (105 C, 2000h)
Rubycon	Japan	ZL Series (Low ESR 4m )
United Chemi-Con	USA	KXJ Series (630V rating)
Samxon	Taiwan	EEU-FR Series (Conductive polymer hybrid)

7. Selection Guidelines

Consider these factors: - Required capacitance tolerance ( 20% standard) - Voltage derating (select 1.25 operating voltage) - Temperature range (automotive requires -40 C to +150 C) - Vibration resistance (screw-terminal better than SMD) - Lifetime calculation: Lx = L0 (T0/ T) (UR/UX) - RoHS compliance for environmental regulations

Industry Trends

Current developments include: - Conductive polymer hybrid capacitors (30% ESR reduction) - Nanoscale dielectric engineering (<0.1 m oxide layers) - AI-driven lifetime prediction models - Bio-compatible electrolyte formulations - 4D printing of anode structures - Integration with PCB substrates

Application Case

In a 3kW server power supply, 4x 450V/470 F capacitors in parallel provide 2220 F total capacitance with 14Arms ripple current handling. The design uses Nichicon U3 series devices with 6.5mm lead spacing, operating at 120 C with 95% voltage derating, achieving 8000-hour MTBF.